This is what mentioned. The reference density you are using is for subsonic speed, and the velocity is for supersonic speed. nFluent calculate the drag coefficient Cd from nDrag Force = Cd * A_ref * Density_ref * V_ref^2 /2So, every simulation, you should change both V_ref and Density_ref ... so, you get the right Cdn
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New Post - Reply To: Cd doesn’t suggest a spike during transsonic speeds.